.navbar {
  background: #4d5b76;
  background: -webkit-gradient(linear, left bottom, left top, color-stop(0, #4d5b76), color-stop(1, #6f80a1));
  background: -ms-linear-gradient(bottom, #4d5b76, #6f80a1);
  background: -moz-linear-gradient(center bottom, #4d5b76 0%, #6f80a1 100%);
  background: -o-linear-gradient(bottom, #4d5b76, #6f80a1);
  filter: progid:dximagetransform.microsoft.gradient(startColorStr='#e3e3e3', EndColorStr='#ffffff');
  -ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#6f80a1',EndColorStr='#4d5b76')";
  box-shadow: 0px 0px 3px #cccccc;
  padding: 0em 1em;
  margin: 0px;
  background-clip: padding-box;
  .navbar-brand{
    color: #fff;
  }

  .navbar-user{
    .dropdown-toggle{
      &:hover{
        background-color: lighten(#444,7);
      }
    }
  }

  .nav {
    > li{         //只到第一层！！！
      > a {
        color: #fff;
        text-shadow: none;
      }
      &:hover {
        background-color: #444;
      }
      > a:hover {
        color: #fff;
      }
    }
  }
  .dropdown-menu {
    left: 0;
    a{
      &:hover{
        background: none;
        color: #000;
      }
    }
  }
  .nav li.dropdown.open > .dropdown-toggle {
    background-color: #444;
    color: #fff;
  }
}